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Your search keyword '"Jha, Sandeep Kumar"' showing total 130 results
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130 results on '"Jha, Sandeep Kumar"'

23. Rapid and label-free detection of Aflatoxin-B1 via microfluidic electrochemical biosensor based on manganese (III) oxide (Mn3O4) synthesized by co-precipitation route at room temperature.

Author

Singh, Avinash Kumar, Dhiman, Tarun Kumar, Lakshmi, G B V S, Raj, Rishi, Jha, Sandeep Kumar, and Solanki, Pratima R

Subjects
FOURIER transform infrared spectroscopy, COPRECIPITATION (Chemistry), BIOSENSORS, DEOXYNIVALENOL, TRANSMISSION electron microscopy, MANGANESE, OXIDES
Abstract

Aflatoxin B1 (AFB1) is the most toxic mycotoxin, naturally occurring in food items, and it causes several types of lethal diseases. Therefore, a rapid and convenient detection method for AFB1 is the first step toward overcoming the effect of AFB1. The current work presents the development of an efficient microfluidic electrochemical-based biosensor using tri-manganese tetroxide nanoparticles (Mn3O4 nps) for AFB1 detection. The Mn3O4 nps were synthesized at room temperature through the co-precipitation route. Its phase purity, structural and morphological studies have been characterized through x-ray diffraction, Raman spectroscopy, energy-dispersive x-ray, Fourier transform infrared spectroscopy and transmission electron microscopy. The mask-less UV-lithography was carried out to fabricate the three-electrode chip and microfluidic channel of the microfluidic electrochemical biosensing system. The designed microfluidic immunosensor (BSA/Ab-AFB1/Mn3O4/ITO) was fabricated using the three-electrode chip, microfluidic channel in poly-dimethyl siloxane. The fabricated sensor exhibited the 3.4 ÎĽ A ml ngâˆ'1 cmâˆ'2 sensitivity and had the lowest lower detection limit of 0.295 pg mlâˆ'1 with the detection range of 1 pg mlâˆ'1 to 300 ng mlâˆ'1. Additionally, the spiked study was also performed with this immunoelectrode and a recovery rate was obtained of 108.2%. [ABSTRACT FROM AUTHOR]

Published
2022
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34. Giant Lipoma of Neck: Case Report and Literature Review.

Author

Jha, Shilpa, Jha, Sandeep Kumar, Patra, Paromita, and Waan, Windeep Singh

Subjects
*LIPOMA, *BENIGN tumors, *FAT cells, *STERNOCLEIDOMASTOID muscle, ADIPOSE tissue tumors
Abstract

Lipomas are benign subcutaneous tumors arising from adipocytes. Although they are the most common tumors found in the body, their presentation in the head and neck region is relatively infrequent. Further, the most common site of presentation in the neck is the posterior part. Here we are presenting a case of a giant lipoma occupying both anterior and posterior triangles of the neck, lying deep to the sternocleidomastoid muscle with retrosternal extension. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Dy2Ti2O7 Ceramic: Structural and Dielectric Studies.

Author

Chandra, K. P., Jha, Sandeep Kumar, Kulkarni, A. R., and Prasad, K.

Subjects
*LEAD-free ceramics, *RIETVELD refinement, *CRYSTAL symmetry, *CERAMICS, *DIELECTRICS, *BARIUM titanate, *CAD/CAM systems
Abstract

Lead-free ceramic sample of Dy2Ti2O7 was prepared by standard high-temperature ceramic synthesis technique. Rietveld refinements of X-ray diffraction data of the ceramic was carried out using FullProf software and determined their crystal symmetry, space group, and unit cell dimensions. Rietveld refinement revealed that Dy2Ti2O7 has a cubic structure with space group Fd-3m. SEM study showed the formation of highly dense ceramic. No phase transition was displayed in the investigated temperature range from the dielectric study. The dielectric constant, as well as loss tangent values, were found, in general, to increase with the rise in temperature. [ABSTRACT FROM AUTHOR]

Published
2020
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39. Structure and Dielectric Properties of Pr2Ti2O7 Ceramic.

Author

Jha, Sandeep Kumar, Prasad, K., Kulkarni, A. R., and Chandra, K. P.

Subjects
*DIELECTRIC properties, *CRYSTAL symmetry, *RIETVELD refinement, *CERAMICS, *TRANSITION temperature, *PRASEODYMIUM, *CAD/CAM systems
Abstract

Non-lead ceramic sample of Pr2Ti2O7 was prepared by standard high-temperature ceramic synthesis method. Rietveld refinements of X-ray diffraction data of the ceramic was carried out using FullProf software and determined their crystal symmetry, space group, and unit cell dimensions. Rietveld refinement revealed that Pr2Ti2O7 has a monoclinic structure with space group P 1 21 1. SEM study showed the formation of highly dense ceramic. The dielectric study displayed the two-phase transitions in the system in the investigated temperature range. Also, the phase transition temperature was found to frequency-dependent which suggested the relaxor-like behavior of the sample. [ABSTRACT FROM AUTHOR]

Published
2020
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